Electroluminescent transparency illuminator

Details Electroluminescent transparency illuminator Electroluminescent transparency illuminator

1992-12-04

1994-08-09

Bertsch, Richard A.

Illumination

Light source or light source support and luminescent material

362 98, 313509, 40367, 345 76, F21V 916

Patent

active

053372247

ABSTRACT:
A compact portable transparency illuminator in the form of a thin light board includes a wafer-thin electroluminescent panel as the illuminating element, with the panel being no more than 1/32nd of an inch in thickness in one embodiment. In one embodiment, the panel is driven by an inverter or controller which converts battery power to 1,000-2,000 Hertz 120 volt AC. In general, the frequency at which the panel is driven is more than twice that normally utilized to drive electroluminescent panels in XY matrix displays to bring the color temperature of the light emitted to the 5,000-6,000 degree Kelvin range for true color viewing of the transparencies.

REFERENCES:
patent: 2972674 (1961-02-01), Thornton, Jr.
patent: 3039013 (1962-06-01), Wilmotte
patent: 3500034 (1970-03-01), Bissell
patent: 4138620 (1979-02-01), Dickson
patent: 4184194 (1980-01-01), Shofu
patent: 4188565 (1980-02-01), Mizukami et al.
patent: 4751615 (1988-06-01), Abrams
patent: 5067063 (1991-11-01), Granneman et al.
patent: 5153386 (1992-10-01), Siefer et al.

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